MCU Phase 5: Every Single Character Confirmed (So Far)

21. Groot (Vin Diesel) - Guardians Of The Galaxy Vol 3

As Endgame ended, Groot was a teenager and while there's likely to be a gap of a few years before Guardians is released, you have to suspect that Marvel will avoid jumping too far into the future again. So we can probably expect to see the crew's story continue from not long after Endgame's end, meaning Groot will still probably be a treenager.

You can have that one.

It would be nice to have a fully grown Groot again, because it's hard to see what else can be said about a younger version, but then there is such a big difference between what old Groot was like and his younger self that we could perhaps find out what made him who he was if we're going to see Rocket's story followed backwards a little more?